這是大學時期的畢業專題，曾經寫過的一個「多檔上傳」的功能，參考國外的文章，至於那篇文章，我也沒特別留下來，今天特別找出來記錄，以防哪一天需要用的時候就可以使用，這也是大學時期對一個剛學程式的學生來講，特別有成就感的一個功能；在這裡還是要提一下檔案上傳可能會影響的資安問題(
ASP.NET FileUpload上傳檔案，讀取Byte檢查副檔名，以圖片為例)。
執行結果
Step 1.先設定Web.config
<configuration>
<system.web>
<compilation debug="true" strict="false" explicit="true" targetFramework="4.0" />
<!-- 可修改maxRequestLength的值來改變上傳限制,單位為K,4096=4MB,15360=15MB -->
<httpRuntime maxRequestLength="15360"/>
</system.web>
</configuration>
Step 2.test_multi-file_fileupload.aspx
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="test_multi-file_fileupload.aspx.vb" Inherits="test_multi_file_fileupload" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function addFileUploadBox() {
if (!document.getElementById || !document.createElement) {
return false;
};
//取得id叫作upload-area元素
var uploadArea = document.getElementById('upload-area');
if (!uploadArea) {
return false;
};
//建立br元素(在Html中叫作換行)
var newLine = document.createElement('br');
//在upload-area中加入換行
uploadArea.appendChild(newLine);
//建立input元素
var newUploadBox = document.createElement('input');
newUploadBox.type = 'file'; //input的類型為file檔案類型
newUploadBox.size = '40';
if (!addFileUploadBox.lastAssignedId) {
addFileUploadBox.lastAssignedId = 100;
};
//設定input的id、name
newUploadBox.setAttribute('id', 'FileF' + addFileUploadBox.lastAssignedId);
newUploadBox.setAttribute('name', 'FileF:' + addFileUploadBox.lastAssignedId);
uploadArea.appendChild(newUploadBox);
addFileUploadBox.lastAssignedId++;
};
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1>測試多檔上傳</h1>
附加檔案：<br/>
<p id="upload-area">
<input id="FileField" type="File" runat="server" size="40" />
</p>
<input id="ButtonAdd" type="button" value="繼續附加" onclick="addFileUploadBox();" />
<asp:Button ID="Button1" runat="server" Text="開始上傳" /><span style=" color:red;">檔案附加不可超過10MB</span><br/>
<asp:Label ID="Send_msg" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
Step 3.test_multi-file_fileupload.aspx.vb
Imports System.IO
Partial Class test_multi_file_fileupload
Inherits System.Web.UI.Page
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'======================
Dim uploads As HttpFileCollection = Nothing
uploads = HttpContext.Current.Request.Files
Dim FileToUpload As HttpPostedFile = Nothing
'======================
'計算全部附加檔案的大小
Dim x_KB As Integer = 0, x_Byte As Integer = 0
Dim x_MB As Double
For i As Integer = 0 To (uploads.Count - 1)
FileToUpload = uploads(i)
x_Byte = x_Byte + FileToUpload.ContentLength
Next
x_KB = x_Byte / 1024 'Byte / 1024=KB
x_MB = x_KB / 1024 'KB / 1024=MB
'信件傳送不能超過或等於10MB
If Int(x_MB) >= 10 Then '取整數
'否則>=10MB
'所有的附加檔案不能超過或等於10MB
Send_msg.Text = "注意：所有的附加檔案加起來不能超過或等於10MB"
Send_msg.ForeColor = Drawing.Color.Red
Exit Sub
End If
'======================
Dim us_f As UShort = 0 '檔案是否重複，重複為1,不重複0
Dim str_FolderName As String = "File"
Dim GEM_MSG As New StringBuilder
Dim FilePath() As String = Nothing '存放檔案路徑
Dim AYN As Integer = -1
For i As Integer = 0 To (uploads.Count - 1)
FileToUpload = uploads(i)
ReDim Preserve FilePath(i)
If FileToUpload.FileName <> "" Then
AYN = AYN + 1
'建立檔案路徑
'第三個參數:指定看由哪一個網頁呼叫此程序,就必須在那個目錄下建立資料夾
FilePath(i) = ServerFilePath(FileToUpload, System.IO.Path.GetFileName(FileToUpload.FileName), str_FolderName) '串聯路徑
'===============================
Dim FileName As String = Nothing
If (FileToUpload.ContentLength <> 0) Then
'System.IO.Path.GetFileNameWithoutExtension(FileToUpload.FileName) '取檔案名稱,不包含副檔名
'System.IO.Path.GetExtension(FileToUpload.FileName) '取副檔名
'判斷檔案名稱是否有重複
If File.Exists(FilePath(i)) = True Then
Dim Uploadfile As String
Uploadfile = HttpContext.Current.Server.MapPath(str_FolderName) '會指定看由哪一個網頁呼叫此程序,就必須在那個目錄下建立資料夾
Dim Repeat_Number As Integer = 0
While (File.Exists(FilePath(i)))
Repeat_Number = Repeat_Number + 1
'如果存在就更改檔名
FileName = System.IO.Path.GetFileNameWithoutExtension(FileToUpload.FileName) & "(" & Repeat_Number & ")" &
System.IO.Path.GetExtension(FileToUpload.FileName)
FilePath(i) = Uploadfile + "\" + FileName
End While
GEM_MSG.Append("<span style=" & Chr(34) & "color:red;" & Chr(34) & ">附加檔案名稱以重複,檔案名稱修改為" & FileName)
Else
GEM_MSG.Append("<span style=" & Chr(34) & "color:blue;" & Chr(34) & ">" & System.IO.Path.GetFileName(FileToUpload.FileName))
End If
End If
Try
FileToUpload.SaveAs(FilePath(i))
GEM_MSG.Append(",附加成功</span><br />")
Catch ex As Exception
GEM_MSG.Append(",附加失敗</span><br />")
'GEM_MSG.Append(",附加失敗" & ex.ToString & "</span><br />")
End Try
'===============================
Else
FilePath(i) = ""
End If
If i = uploads.Count - 1 And AYN <> -1 Then
GEM_MSG.Append("<hr size=" & Chr(34) & "1" & Chr(34) & " />")
End If
Next
Send_msg.Text = GEM_MSG.ToString
Send_msg.ForeColor = Drawing.Color.Black
End Sub
'建立檔案路徑,
Function ServerFilePath(ByVal FileToUpload As HttpPostedFile, ByVal FileName As String, ByVal Folder_name As String) As String
Dim Uploadfile As String
Uploadfile = HttpContext.Current.Server.MapPath(Folder_name) '會指定看由哪一個網頁呼叫此程序,就必須在那個目錄下建立資料夾
If Directory.Exists(Uploadfile) = False Then '檢查目錄存不存在
'不存在就建立資料夾
Directory.CreateDirectory(Uploadfile)
End If
If (FileToUpload.ContentLength <> 0) Then
Uploadfile = Uploadfile + "\" + FileName '建立檔案路徑
Else
Uploadfile = ""
End If
Return Uploadfile
End Function
End Class
